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(No Model.) 2 Sheets-Sheet 1.

J, M. RICHARDSON.

ROCK DRILLING MACHINE,

No. 311,786. Patented Feb. 3, 1885.

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(No Model.) 2 Sheets--Sheet 2. J. M. RICHARDSON.

ROCK DRILLING MACHINE.

Patented Feb. 3, 1885.

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ATENT OFFICE.

JEREMIAH M. RICHARDSON, OF SALT LAKE CITY, UTAH TERRITORY, AS-

SIGNOR OF ONE-THIRD TO JOSEPH L. HEYWOOD, OF SAME PLACE.

ROCK-DRILLING MACHINE.

SPECIFICATION forming part of Letters Patent No. 311,786, dated February 3, 1885.

Application tiled June 7, 1984. (No model.)

To all whom it may concern:

Beit known that I, JEREMIAH M. RICH- ARDSON, a citizen of the United States, residing at Salt Lake City, in the county of Salt 5 Lake and Territory of Utah, have invented certain new and useful Improvements in Rock- Drilling Machines; and I do hereby declare the following to be a full, clear, and exact descript-ion of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The object of my invention is to provide a rock-drilling machine of simple construction, which shall perform more conveniently and r economically than heretofore the functions of holding the drill against the rock to be operated upon, striking it a succession of heavy blows, rotating it gradually as it is struck, and feeding it forward into the hole which it produces. To this end I provide a frame capable of being conveniently and firmly fixed in position. Upon this is supported a sliding carriage which carries the drill, the latter being so mounted that it is free to move forward. in said carriage for a limited distance when it is struck, while by a suitable engagement with the carriage, which prevents its being moved backward therein, it is held against the rock to be operated upon. The forward 0 tendency of the carriage may be caused by a spring or by weights, as shown, which act constantly upon it; or by suitable devices it may be fed forward at will by hand. In the carriage is mounted a heavy hammer capable of 5 being reciprocated forward or backward therein. It is normally held forward by a strong spring or by weights, if preferred, and when in that position bears against the rear end of the drill. A mechanism is provided whereby 0 the hammer may be drawn or forced back, and then released to deliver its blow against the drill. By suitable devices this mechanism may also bemade to turn the drill partially in the intervals between the blows.

5 It will be understood that, though particularly suitable to be operated by hand, the machine may be driven by steam or other power, if preferred, by the simple addition of a beltpulley or other equivalent means of connection with said power.

For the purpose of clearly describing my invention I have shown in the accompanying drawings a construction whereby it may be carried into effect, thoughother equivalent constructions may be used, if preferred.

Referring to said drawings, Figure lis a side elevatiomof the rock-drilling machine. Fig. 2 is a top plan view of the same, the hammer being shown as forced back and about to deliver its blow. Figs. 3 and 4 are detail 6 views on a large scale.

The supporting-frame consists, as shown, of two parts, A and O.

A represents a rectangular frame, preferably of metal, supported in position for work- 6 ing bythe hollow post B, to which it is hinged by a clamp, B, adjustable to any desired height on said post. The form of post shown is one adapted to be held between the roof and bottom of a tunnel or drift. Claws b may be forced outward by screws 12 to obtain the desired hold. The forward end of the frame A is supported by points a, which engage with the rock to be operated upon.

Ois a carriage adapted to slide longitudinally upon the frame proper. A. Suitable guides, a, hold it in position thereon. The carriage G carries the drill, the hammer, and the actuating machinery, and is moved forward to the work constantly by the weightsE 8 in an obvious manner, or at will by the hand wheel (1, according to the exigencies of the position of the machine. The wheel 02 operates to turn a pinion, d engaging with a stationary rack, a, secured to the frame A. If preferred, however, a simpler feed may be used, as shown in Fig. 3, consisting of a screw,

(1*, engaging with a thread in the frame A, and bearing directly against the rear of the carriage. o

F is the drill, supported and guided in the frame or carriage O by means of the boxes f and hinged capsf which supports allow the drill a free forward and rotary play.

G is a spur or ratchet wheel,screwed to the 5 drill near its rear end, and g is a collar similarly secured to the drill in front of one of its bearings, ff through which collar the forward tendency or movement of the carriageG is communicated to the drill. ioo

is a collar secured to the drill adj ustably, to facilitate the loosening of the drill if it shou1d become jammed in the rock. It will be observed that a drill of the ordinary character is quite suitable to receive these attachments and be mounted in the bearings f f. A shaft, I, mounted on the carriage G transversely thereto, carries the hammer-operating cams H H. The shaft I may be rotated in the direction of the arrow 1) either directly or by a train of gearing, J J, as shown, operated by hand-cranks K.

. By means of projections h" h on one of the cams H, adapted to engage with the gearwheel G, the drill is given a partial rotation after each blow of'the hammer. The drill is liable, occasionally, to become jammed in the rock and held so firmly that it cannot be rotated by the projections h,- but another blow of the hammer may suffice to loosen it, and it is therefore desirable that means shall be provided so thatthe projections h may yield and not stop the operation of the machine; I-have accomplished this by the devices illustrated in Fig. 4. The forward ends of the projections h are beveled,so that under sufficient pressure, the wheel G being held immovable, said projections will be forced backward into a recess in the cam H. A spring, holds the parts h normally in a position to engage with and r0- tate the wheel G, and is of sufficient strength to prevent the projections from yielding backward under any ordinary pressure.- The strength of the springs h may be regulated by means of screw-plugs 71 which close the rear ends of the recesses.

L is the hammer, of suitable material,preferably metal, supported by the carriage 0, so that it may easily be reciprocated therein. It is situated in line with the drill and below the plane of the shaft I.

M is a strong spring, placed between the rear of the hammer and the carriage 0. It is preferably kept in place by a rod, m, attached to said frame and passing loosely through an aperture in the hammer.

The operation of the device is as follows, starting with the position shown in the drawings: A further rotation of the cams H H will disengage them from the front of the hammer, and the latter will be thrown against the rear of the drill with a force depending upon its weight and the strength of the spring M. The drill has in the meantime been held against the rock by the pressure of the carriage against the collar 9. It will be noted that on account of the capability of forward movement relative to the carriage O, which the drill possesses, none of the shock of the hammer is transmitted to said carriage, but it is all expended upon the rock. After the blow is delivered the downward movement of the front end of the cam H having the projections h causes the latter to engage with and partially rotate the gear-wheel G, and consequently the drill. The succeeding backward and upward movement of the same end of the cams forces back the hammer against the spring M for another blow.

The spring M may be flat or elliptical instead of spiral, as shown; or other equivalent devices for forcing the hammer forward may be substituted there for without departing from my invention.

What I claim as of my invention, and desire to secure by Letters Patent, is i 1. In a rock-drilling machine, the combination of a stationary frame, a sliding carriage thereon, a drill mounted in said carriage, freely movable forward therein, and having a shoulder against the rear portion of which the carriage bears, and pressure devices, substantially as described, applied to the carriage for holding it against said shoulder with a yielding pressure, whereby the full force of the hammer is received by the drill without shock to the carriage, substantially as set forth.

2. In a rock-drilling machine, the combina tion of a stationary frame, a sliding carriage thereon, adrill mounted in said carriage,freely movable forward therein and having a-shoulder against the rear portion of which the car riage bears, pressure devices, substantially as described, applied to the carriage for holding it against said shoulder with a yielding presssure, the sliding hammer supportedin said frame independently of and in line with the drill, and devices for forcing the hammer against the drill, substantially as set forth.

3. In a rock-drilling machine, the combination of a stationary frame, a sliding carriage thereon, a drill mounted in said carriage,freel y movable forward therein and having a shoulder against the rear portion of which the carriage bears, pressure devices, substantially as described, applied to the carriage for holding it against said shoulder with a yielding pressure, a reciprocating hammer, a cam for forcing back said hammer, and a ratchet-wheel rigidly secured to the drill, said cam being provided with a lateral projection engaging with the wheel, sul istantially as set forth.

4. In a rock-drilling machine, the combina tion, with the supporting-frame, of the drill having a ratchet-Wheel, and a part, H, adapted to be moved past the periphery of said wheel, and having a yielding lateral projec tion adapted to engage with the wheel to turn the drill and to escape therefrom should said drill become jammed, substantially as set forth.

5. In a rock-drilling machine, the combina,

In testimony whereof I affix my signature in.

presence of two witnesses.

JEREMIAH M. RICHARDSON. Witnesses:

ARTHUR BROWN, W. A. OooKE.

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